Legendary American showman Phineas T Barnum designs a space rocket, which he hopes will take him to the moon, but his scheme is threatened when two crooks get wind of his plan and decide to sabotage the craft. Sci-fi comedy, starring Terry-Thomas, Lionel Jeffries, Burl Ives, Gert Frobe, Dennis Price and Hermione Gingold.

Phineas T. Barnum and friends finance the first flight to the moon but find the task a little above them. They attempt to blast their rocket into orbit from a massive gun barrel built into the side of a Welsh mountain, but money troubles, spies and saboteurs ensure that the plan is doomed before it starts...